There is a reason why we don’t let the user make the synchronization twice.
In fact, Kinomap lets content creators do the synchronization on their own. Once done, Kinomap has a post-processing check related to the incline (gradient).
That's why we don’t let the user change the synchronization later on.
Also because we check with Strava to get the segments within the track and create a video section per segment (especially for running and cycling videos).